Electropneumatic brake.



. w. v. TURNER.

BLECTBOPNEUMATIG BRAKE.

APPLIOATION FILED nov. as, 1913.

1,107,38 1 Pa ten ted Aug. 18, 191 1 wn'N ESSES INVENTOR M amwm wAL'rnav. or nnenwoon, PENNSYLVANIA, ASSIGNOB. are. THE meme.-

for rmmsr'nvsru'a.

HOUSE AIR; COMPANY, OF'WILMEBDINQ, PENNSYLVANIA, CORPORATION I I v.nnscrnormuna ric BRAKE A lication filedifovember 25, 913. Serial nasoasic.

[ J hall concern: r Be it known that I, WALTER V. acitizen of the UnitedStates, resid ng at Edgewood, in .the county of Allegheny and-- State ofPennsylvania, have invented new and useful Improvements in ElectropneuinaticfBrakes, of which the following is a specification, e 1 This.invention [relates to fluid pressure brakes, and more particularly to a.brake adapted to be controlled either electrically .or pneumaticall Ithas hereto ore'beenproposed -to emp y electro-pncumatic brake inwhich te i 'akes may be applied by efi'ecting a reduc- 1 A inbrake. 'ipe' pre,"eit her directly, ny; means of an electrically controlled de- Aswell known, 'if ,the'rate ofpreduc lion in brake pipe pressureieirceedsa certain 'degree the piston ofthe triple or equalizing f valve'devic'e'will be 'shiftedto emergency position, causing anemergencyapplication of the brakesfand if the tripleivalve is of V dent that thetriple valve parts will be to" emergency position, causing an undesiredemergency application; of the bakes.

The-principal object of my invention is to provide means for obviatingthe above difli- 'culty.-' In the accompanying drawing; Figure 1 is aview of an electro-pneumatic brake equipment, showing the electro-pneumatic brake controlling valve mechanism insec- 7 tion, with the parts innormal'rele'ase poi ."sition; and Fig. 2 a sectional view of theequalizing portion of the electro-pneumatic brake controlling valvemechanism, showing the parts in serv ce application position. As.shownin'the drawing, a triple valve device lot the usual quick action typemay be i provided having Zbrak'e pipe 2 connected the quick action type,a local venting of I thereto and connected by the respective pipes pipe2 and main slide valve 9' carrying the graduating valve 10 and containedin valve 't'ibn valve mechanism .12 of the usual type haustfpassage 15,.2

' Anaelectric jservi mag euz jcontrols the-venting of the brakepipe 2through passage l8 toirpassage 19" containinga' check valve -20'ai1dleading .to the brake cylinder passage 21'. zTheelectric'service passagel8 -opens into -pi s'ton' chamber Sand is located so that when the,usual service ort 22in the main sli'de said-passagez-is about lineand-line with the triple va 7, as shown in Fig. 2 of the drawing. Itwill now be seen that by thisarrangementof ports, any'movement of thet'riple valve parts tending to increase the electric vent port 18. V

In operation, ifthe service magnet 17 is energized to effect an electricservice application of the brakes, the valve 16 is opened and fluidunder pressure is vented fromfthe piston chamber 8 and the brake pipe 2to size as to limit the rate of HOW to the desired shifted to serviceposition, opening the service port, 22, so that fluid is supplied fromthe auxiliary reservoir to the brake cylinshould happen to bee brakepipe leak of any 3 and 4 'tothe' auxiliary reservoir 5' andthe Qpistonchamber 8 communicating with brake [For controlling' thebrakeselectrically a release'niagnetl 13 adapted to. operate'a re lease valve14=. .may be provided, the release valvel'l i controllingthe brakecylinder ex:

valvebf-theftfip e valve device is. partlyopen, theijnner edge of theport opening of outer ed oi-th'efusual piston ring of the service'rate.The triplevalve piston is thus.

f Specification. 0151mm mm, PatentedAugi-IS, 191:4.

' chamber'll' open to the auxiliary reservoir ,5. I Thetriplevalvedevi'ce also has a quick a'c-' for effecting a localreduction in brake pipe opening of the service port 22 will at, the sametime tend to restrict the openingof the the brake cylinder, the passagebeing of such der in the usual manner. If, however, there consequence,the reduction in brake" pipe i pressure soefiected added to thereduction caused by the opening'of the electric service valvemight besuflicient to move the triple I valve piston 7 outwardly towardemergency position. Should this occur, the movement "both'by therestriction or complete closureof the pasta 'l -automatically re'saia'sand finally closes the electric service port 18, while at the same. timethe opening of the usual triple valve service port 22isincreased.. Itwill thus. be seen that'the tendency to move out beyond servicepositionis checked of theport 18. wliichcuts ofi thefventing'fof V fluidfrom the brake pipeby action of the electric service valve and by theincreased rate of reduction in auxiliary reservoir ressure produced bythe enlargement '-o the 'openin -of thetriple valve. service port-22.

' 'It wi 1 now be clear; that m improvement l parts beyond serviceposition in making an prevents the. movementof -t e, triple valveelectric service application of the brakes by automatically closmg theelectric service brake pipe vent Tport.

Having now described my invention, what I claim .as new and desire tosecure by Letters Patent, is:--

4 1. In a' fluid pressure brake,the combina tion with a brake pipe andanequalizing. valve device operated-upon, a reduction in brakepiperessure for efiecting an appli cation of t e brakes, "of,electrically controlled means for -venting fluid from" the pipe througha-passage controlled by'said brake pipe having a vent port adapted tobegradually restrlcted by the movement of the equalizing valve dev ce togradually open the usual service port.

2. In a fluid pressure brake, the 'combi nation with a brake pipe and anequalizing valve device comprisin Iva ve means for controlling a brake'cyhn er service port and a piston operated upon a reduction inbrakepipe pressure for jactuating said valve means, of an electric'allgcontrolled valve device adapted to vent' uid from the brake piston toefiect a service reduction in b rake p pe pressure, the port opening ofsaid passage to the brake ipe being gradually re- ,45

duced'in as t e brake cy nderservice port opening is' graduallyincreased in area.

'- 3.1 In-a fluid pressure brake, 'the combina- .tion with a'brake pipeand an equalizing valve'device operated upon a reduction in brake piperessure for effecting an application of a e brakes, of electr callycontrolled means for ventingfluid from -the brake pipeto efiecta servicereduction in brake pipe pressure and having a vent port opening into thepiston chamber of the trolled by t e piston ring'of said piston.

equalizing piston and adapted to be con- 4 4. In a fluid pressure brake,the combination'wi'tha brake pipe andan equalizing 'valve device havinga piston operating upon a gradual reductioninbrake pipe pressure to makea partial traverse and effect a service application of'the brakes, ofelectri cally controlled means for venting fluid from" the brakepipethrough a'port controlled by said piston, said portbeing adapted to beBer at a point intermediate the extreme pos'itions, of the triple valveiston.

'- In testimony whereof. I have hereunto myiha'nd V WALTER V. TURNERWitnesses: 1 a A. M. Grammars, 'Howm. J. BRUSH.

